Vibrating rollers



Dec. 28, 1965 R. P. GREEN 3,225,669

VIBRATING ROLLERS Filed Nov. 1, 1961 4 Sheets-Sheet 1 Dec. I28, 1965 R. P. GREEN 3225569 VIBRATING ROLLERS Filed Nov. 1, 1881 4 sheets-shee'z 2 Dec. 28, 1965 R. P. GREEN VIBRATING ROLLERS 4 Sheets-Sheet 3 Filed Nov. 1. 1961 Dec. 28, 1965 R. P. GREEN 3,225,669

VIBRATING ROLLERS Filed Nov. 1, 1961 4 Sheets-Sheet 4.

United States Patent O 3,225,669 VEBRATING ROLLERS Rowland Percy Green, Bath, England, assignor to Stethert 3; Pitt Limited, Bath, Engiand, a corporation of the United Kingdom Filed Nov. 1, 1961, Ser. No. 149,313 Claims priority, application Great Britain, Nov. 3, 1960, 37,881/60 11 Claims. (Cl. 94-50) This invention relates to vibrating rollers.

The problem of operating a roller alongside a kerbstone or a building does not arise in a three-wheeled roller, but in a tandem roller, especially vibratory rollers, due to the design of the roller, it has not hitherto been feasible to operate the roller alongside a kerb because it is usual for the vibratory roll to be self-propelled and therefore for convenience the drive to the vibrator shaft is at one side and for the traction drive at the other.

The present invention is concerned With an improved design of self propelled vibratory roller which is side driven so that one side of the roll remains completely unobstructed.

According to the present invention, in a self propelled vibratory roller the traction and the vibratory shaft drives are arranged at one side of the roller and means are provided supporting the roller so that the other side thereof is completely unobstructed, the means for supporting the roller at its unobstructed side comprising a cantilevered dead shaft supported on an end frame to extend through, and projecting beyond, a hollow vibratory shaft, on the end of which dead shaft is secured a resilient shear mounting device supporting the bearing for the roller shell, the bearing for the roller shell at the other side of the roller being carried by a resilient shear mounting device on the end frame, the roller shell being formed, at least at its unobstructed end, in such manner that the free end of the dead shaft and its associated supporting mechanism lie wholly or mainly within the roller shell.

The invention is more especially applicable to a roller in which the traction drive is by a chain and sprocket and in carrying out the invention, the driven sprocket, by which drive is transmitted from the power unit to the roll, is mounted on an axis, which lies between the perirneter of the roll shell and the axis thereof. By mounting the driven sprocket in this position and fitting the roller shell at that end with an end plate of dished construction, it enables advantage to be taken of the space between the roller axis, the driven sprocket and its drive chain being arranged in the same plane as the drive to the vibratory shaft.

In a preferred construction, the driven sprocket of the chain and sprocket drive to the roller shell, is fast on one end of a countershaft, which is journalled to rotate in a torque or bridge plate of annular form and mounted concentrically With respect to the roller shell axis, the other and inner end of the countershaft having fast thereon a spur pinion meshing with a toothed driving ring on the end plate of the roller shell. The annular torque plate may be attached to the resiliently mounted bush in which a spigot mounting for the roller shell with the vibratory shaft are mounted to revolve. For this purpose the flange on the bush, to which the resilient shear mounting is united is extended radially outwards and the torque plate, which, in section, is of channel shape is formed in its inner limb with a radial flange by which it is rivetted to the fiange of the bush.

The roller Suspension at each preferably comprises an assembly each including two components having surfaces in a plane at right angles to the roller axis and interconnected Vby rubber-in-shear in which the innermost comr. ICC

ponent at each end has a bush providing a bearing to receive a spigot on the roller end plate, the other components of each assembly being secured respectively to the end frame and the outer end of the dead shaft.

The torque plate may be supported from the machine frame through the intermediary of resilient blocks to provide for torque reaction, which is set up on transmission of drive to the roller shell when the roller is in operation and also to protect the main flexible mounting from excessive strain from this source.

The transmission drive both to the roller shell and to the vibratory shaft may be totally enclosed in an end frame of box construction.

According to a further feature of the invention a ring of resilient material e.g. rubber, is mounted on the outer end of the flanged bush of the resilient mounting so that in the event of excessive roll deflection it will engage a snubbing plate of larger diameter carried by the outer plate or flange of the flexible mounting attached to the main frame.

The invention is illustrated in the accompanying drawings in which:

FIGURE 1 is a side elevation partly in section of a side driven vibratory roller constructed in accordance with a preferred embodiment of the invention;

FIGURE 2 is an end-on view, and FIGURE 3 a plan view showing the main (side) frame supporting the cantilever or dead shaft; and

FIGURE 4 is a detail section on the line IV-IV of FIGURE 2.

In the drawings S indicates the roller shell, to which a vibratory motion is imparted by means of a revolving tubular shaft, indicated at T fitted with eccentric masses W.

A'main or end frame, which is indicated generally at A, includes a horizontally arranged table or bed plate extension portion B, on which is supported an engine E, which drives direct through a clutch C to a gearbox G having two output or driving shafts, one for the traction drive of the roller shell and the other for the vibratory shaft.

In order to prevent vibration being transmitted from the roller shell S to the main frame, the Suspension includes rubber-in-shear mountings M, which are similar in design to those forming the subject of United States patent to Kerridge No. 2,671,386, dated March 9, 1954.

The bracket which supports the foot or trailing roller is shown at F. An arm H, which may or may not be oflset, carries the steering handle and controls.

In the present invention the main or end frame A is of box construction and includes inner and outer plates 1 and 2 in which are two openings, the upper opening 3 (normally closed by an inspection cover 3') giving access to the drive shafts from the gearbox, as hereinafter described, while the lower opening 4 is provided With a reinforcing fiange and has secured therein a pedestal bracket 5 mounting a dead shaft or cantilever 6. The cantilever shaft 6 supports at its end a bearing support indicated at D and described in detail hereafter.

In the inner Wall 1 of the box-section end frame A is a central opening provided with a flange 7, to which is fiXed an annulus S forming one component of the rubber-inshear mounting, the rubber annulus of which is indicated at 10, the other component consisting of a bush 12 formed with a radial flange 11. The inner surface of bush 12 is machined to provide a bearing for the roller.

The roller shell S is fitted with dished end plates 13, 13' which are fast with hub sentries 14, 14', the hub centre 14 having an inner recess 50 closed by a detachable cap ring to receive self-aligned bearings within which the vibratory shaft T is mounted to revolve.

The hub centre 14 includes an axially extending bearing fiange or spigot 15 which is machined to revolve freely within the associated bush 12 of the resilient mounting 10.

The vibratory shaft T is driven by a belt drive from a driving pulley 17 fast on one output shaft of the gearbox G and connected through a belt 18 to the end of the vibratory shaft T, which isV extended beyond the end of the roller shell S for this purpose.

The drive to the roller shell is by means of a chain drive and includes a driving sprocket 21 fast on the second output shaft from the gearbox G to a sprocket 22 which is mounted eccentrically to the axis of the dead shaft or cantilever 6. For this purpose the radial flange 11 of the bush 12 of the rubber-in-shear mounting has secured to it a torque or bridge plate 25 (see also FIG. 4) provided with a bearing boss 26 in which is journalled to rotate a countershaft 28.

The torque plate is also anchored to the main frame by means of a number of resilient connectors 41 consisting of studded (metal) end discs 42 bonded to a rubber centre, each stud 43 being threaded to enable the connector end studs to be bolted respectively to a flange 45 on the main casing and to the torque plate 25.

The connectors 41 function as torque members and their purpose is to absorb torque reactions which may become of some magnitude during changes from forward to reverse.

In operation therefore the connectors 41 would absorb such torque reaction leaving the main fiexible mounting free to accommodate static defiection only. This is particularly desirable in the case where the flexible mountings 10-10' are identical on both sides of the roller.

It is clearly desirable from the point of view of vibration insulation for the flexible mountings 10-10' to be identical so that they will have the same vibration insulating effect. It follows that unless the flexible connectors 41 or some other means are introduced the flexible mounting 10 on that side of the machine would be subjected to overstressing.

On the inner end of the countershaft 28 is a driving pinion 29 in mesh with a toothed ring 30 carried by an axial fiange on the end plate 13 of the roller shell. On the outer end of the countershaft 28 is connected the drive sprocket 22.

The means by which the outer end of the roller shell S is supported to revolve includes a similar set of components to those used at the inner end of the shell, as previously described. Thus the end plate 13' is fitted With a hub centre 14' within the recess 50' of which is corresponding set of self-aligning bearings.

The rubber-in-shear mounting includes an annulus of rubber 10' similar to the part 10 and mounted in compression between an inner component 31 in the form of a flanged bush corresponding to the component 11, 12 and an outer component 32. The inner and outer components 31 and 32 are substantially at right angles to the axis of the roller shell. It will be seen that the cantilever arm 6 is provided with a shouldered end 33 on which is secured the end bearing support M in the form of a hub plate 34 having an axially inset fiange 35 to which is secured, by studs, the outer component 32 of the resilient mounting. 36 is a cover plate.

It will be noted that the entire Suspension at the outer end of the dead shaft or cantilever 6 is housed entirely Within the end plate 13' of the roller shell and that the cover plate of the engine and gearbox housing indicated at P does not extend beyond the end of the roller so that the machine can be driven close against a kerb or Wall, until it is almost touching.

In order to limit the amplitude of movement between the roller shell and the main frame, a bumper stop or snubbing device, consisting of a rubber ring 40, is mounted on the outer end of the axial fiange of the bush inner component 11 of the resilient mounting for engagement with an aXial flange formed on the outer component 8 of said mounting.

The provision of a snubber or resilient ring 40 enables load in any direction to be withstood with equal ability and minimum stress and therefore damage is unlikely.

The construction of applicanfis roller is such that ingress of dirt or foreign matter is reduced to a minimum. The effective sealing of the transmission drive to the roll shell against foreign matter, including material being compacted, is ensured by the bridge or torque plate 25, which is further preserved by the flexible mountings 10 being of annular formation.

I claim:

1. A self propelled vibratory roller comprsing a roller shell having one unobstructed end and one other end and having end plates, each of said end plates having an opeing substantially centrally located therein; a central hub piece having an axial spigot mounted on each of said end plates; a hollow rotatable vibratory shaft mounted to revolve in said hub pieces in bearing relationship thereto; an end frame structure adjacent said other end of said roller shell and having an extension portion adjacent said roller sbell; a power unit disposed on said extension portion; first drive means coupled to said power unit adjacent said end frame structure for imparting drive to said roller shell; second drive means coupled to said power unit adjacent said end frame structure for imparting drive to said vibratory shaft; a first and a second bearing means respectively rotatably mounting said axial spigots; and means supporting said bearing means on said end frame structure with said one end of said roller shell unobstructed, the means supporting said first bearing means at said unobstructed end of said roller shell comprising a cantilevered dead shaft having one end secured to said end frame structure and a free end extending through. and projecting beyond said vibratory shaft, and a resilient mounting device secured to said free end of said cantilevered dead shaft and being coupled with said first bearing means, the means supporting said second bearing means at said other end of said roller shell comprising another resilient mounting device secured to said end frame structure and being coupled with said second bearing means, each of said resilient mounting devices comprising a pair of components, each pair including an outer component disposed relatively close to an adjacent end of said cantilevered dead shaft and an inner component spaced from said outer component toward the opposite end of said cantilevered dead shaft, both said components being disposed in planes at right angles to the axis of said roller shell, and rubber means interconnecting said inner and outer components, the outer component of one of said pairs of components being secured to said end frame and the outer component of the other of said pairs of components being secured to said free end of said cantilevered dead shaft, the one of said end plates at said unobstructed end of said roller shell being dished and the free end of said cantilevered dead shaft and the supporting means an bearing means at said free end of said cantilevered shaft lying within the dished end plate and said roller shell.

2. A vibratory roller as claimed in claim 1 in which said end frame structure has an end frame opening through which said vibratory shaft extends and the outer component of said other resilient mounting device is formed in an annulus and is secured to said end frame structure around said end frame opening.

3. A vibratory roller as claimed in claim 1 in which said end frame structure accommodates said first and said second drive means side by side in the same plane.

4. A vibratory roller as claimed in claim 1 and having means to limit the amplitude of movement of said roller shell relatively to said frame structure radially with respect to the axs of rotation of said roller shell, comprising resilient rings respectively mounted on said inner components of said resilient mounting devices and adapted to engage with said outer components of said mounting devices.

5. A vibratory roller as claimed in claim 1 in which said inner component of said other resilient mounting device at said other end of said roller Shell is formed with a radial flange and includes an annular bridge plate having a bridge plate bearing formed therein, said 'first drive means including a countershaft journalled in said bridge plate bearing and through which drive is transmitted to the roller shell.

6. A vibratory roller as claimed in claim 5 wherein said countershaft has an inner and an outer end and said first drive means includes a spur pinion mounted at said inner end of said countershaft, a toothed ring on said roller shell meshing with said spur pinion, and Chain and sprocket means to drive said countershaft.

7. A vibratory roller as claimed in claim 5 and having resilient torque reaction connectors disposed between and connected to said bridge plate and said end frame structure.

8. A vibratory roller as claimed in claim 7 wherein said resilient torque reaction connectors comprise end disks formed with fixing studs securing said connectors to said end frame structure and to said bridge plate, and a block of rubber bonded to each of said disks.

9. A self propelled vibratory roller comprising a frame including an end frame structure; a cantilevered dead shaft mounted at one of its ends on said end frame structure and projecting horizontally therefrom; a roller shell through which said cantilevered dead shaft projects; means rotatably mounting said roller shell at one of its ends adjacent said end frame structure and including a first bearing part on said end of said roller shell, a second bearing part in bearing relation to said first bearing part, and a resilient cushion interposed between and being fixedly connected to said second bearing part and to said end frame structure; other bearing means for rotatably mounting said roller shell at the other of its ends; resilient means for supporting said other bearing means on the other and projected end of said cantilevered dead shaft; a vibratory shaft; bearing means mounting said vibratory shaft for rotation within said roller shell and for transmitting vibrations from said vibratory shaft to said roller shell; power means mounted on said frame; means for transmitting drive from said power means to said vibratory shaft; and independent drive transmitting means for transmitting drive from said power means to said roller shell for rotating the latter while said resilient cushion and said second bearing part are held against rotation by the connection of said resilient cushion to said end frame structure, said independent drive transmitting means comprising a countershaft, means mounting said countershaft on said end frame structure for rotation eccentrically with respect to said cantilevered dead shaft, means for transmitting drive from said power means to said countershaft, a pinion fixed on said countershaft, and a ring gear fixed to said roller shell and meshing with said pinion.

10. A self propelled vibratory roller comprising a frame including an end frame structure; a cantilevered dead shaft mounted at one of its ends on said end frame structure and projecting horizontally therefrom; a roller Shell through which said cantilevered dead shaft projects; means rotatably mounting said roller shell at one of its ends adjacent said end frame structure and including a first bearing part on said end of said roller shell, a second bearing part in bearing relation to said first bearing part, and a resilient cushion interposed between and being fixedly connected to said second bearing part and to said end frame structure; other bearing means for rotatably mounting said roller shell at the other of its ends; resilient means for supporting said other bearing means on the other and projected end of said cantilevered dead shaft; a vibratory shaft; bearing means mounting said vibratory shaft for rotation within said roller shell and for transmitting vibrations from said vibratory shaft to said roller shell; power means mounted on said frame; means for transmitting drive from said power means to said vibratory shaft; independent drive transmitting means for transmitting drive from said power means to said roller shell for rotating the latter, said independent drive transmitting means comprising a driving element mounted on said second bearing part, and a driven element mounted on said first bearing part and operatively engaging said driving element; and resilient torque reaction means interposed between and connecting said end frame structure and said second bearing part to each other independently of the connection of said second bearing part to said end frame structure by said resilient cushion.

11. A vibratory roller according to claim 10 in which said resilient torque reaction means is located radially outwardly beyond said resilient cushion with respect to the axis of said first and second bearing parts.

References Cited by the Examiner UNITED STATES PATENTS 2,248,478 7/1941 Mall 94-50 2,671,386 3/1954 Kerridge 94-50 2,873,656 2/1959 Andersson 94-50 2,925,759 2/1960 Hillis 94-50 3,007,379 11/1961 Ellis 94-50 3,105,424 10/1963 Dion 94-50 FOREIGN PATENTS 101,648 7/1937 Australia.

767,968 2/ 1957 Great Britain.

819,119 8/ 1959 Great Britain.

CHARLES E. OCONNELL, Primary Examner.

J'ACOB L. NACKENOFF, Examiner. 

1. A SELF PROPELLED VIBRATORY ROLLER COMPRISING A ROLLER SHELL HAVING ONE UNOBSTRUCTED END AND ONE OTHER END AND HAVING END PLATES, EACH OF SAID END PLATES HAVING AN OPEING SUBSTANTIALLY CENTRALLY LOCATED THEREIN; A CENTRAL HUB PIECE HAVING AN AXIAL SPIGOT MOUNTED ON EACH OF SAID END PLATES; A HOLLOW ROTATABLE VIBRATORY SHAFT MOUNTED TO REVOLVE IN SAID HUB PIECES IN BEARING RELATIONSHIP THERETO; AN END FRAME STRUCTURE ADJACENT SAID OTHER END OF SAID ROLLER SHELL AND HAVING AN EXTENSION PORTION ADJACENT SAID ROLLER SHELL; A POWER UNIT DISPOSED ON AID EXTENSION PORTION; FIRST DRIVE MEANS COUPLED TO SAID POWER UNIT ADJACENT SAID END FRAME STRUCTURE FOR IMPARTING DRIVE TO SAID ROLLER SHELL; SECOND DRIVE MEANS COUPLED TO SAID POWER UNIT ADJACENT SAID END FRAME STRUCTURE FOR IMPARTING DRIVE TO SID VIBRATORY SHAFT; A FIRST AND A SECOND BEARING MEANS RESPECTIVELY ROTATABLY MOUNTING SAID AXIAL SPIGOTS; AND MEANS SUPPORTING SAID BEARING MEANS ON SAID END FRAME STRUCTURE WITH SAID ONE END OF SAID ROLLER SHELL UNOBSTRUCTED, THE MEANS SUPPORTING SAID FIRST BEARING MEANS AT SAID UNOBSTRUCTED END OF SAID ROLLER SHELL COMPRISING A CANTILEVERED DEAD SHAFT HAVING ONE END SECURED TO SAID END FRAME STRUCTURE AND A FREE END EXTENDING THROUGH AND PROJECTING BEYOND SAID VIBRATORY SHAFT, AND A RESILIENT MOUNTING DEVICE SECURED TO SAID FREE END OF SAID CANTILEVERED DEAD SHAFT AND BEING COUPLED WITH SAID FIRST BEARING MEANS, THE MEANS SUPPORTING SAID SECOND BEARING MEANS AT SAID OTHER END OF SAID ROLLER SHELL COMPRISING ANOTHER RESILIENT MOUNTING DEVICE SECURED TO SAID END FRAME STRUCTURE AND BEING COUPLED WITH SAID SECOND BEARING MEANS, EACH OF SAID RESILIENT MOUNTING DEVICES COMPRISING A PAIR OF COMPONENTS, EACH PAIR INCLUDING AN OUTER COMPONENT DISPOSED RELATIVELY CLOSE TO AN ADJACENT END OF SAID CANTILEVERED DEAD SHAFT ND AN INNER COMPONENET SPACED FROM SAID OUTER COMPONENT TOWARD THE OPPOSITE END OF SAID CANTILEVERED DEAD SHAFT, BOTH SAID COMPONENTS BEING DISPOSED IN PLANES AT RIGHT ANGLES TO THE AXIS OF SAID ROLLER SHELL, AND RUBBER MEANS INTERCONNECTING SAID INNER AND OUTER COMPONENTS, THE OUTER COMPONENT OF ONE OF SAID PAIRS OF COMPONENTS BEING SECURED TO SAID END FRAME AND THE OUTER COMPONENT OF THE OTHER OF SAID PAIRS OF COMPONENTS BEING SECURED TO SAID FREE END OF SAID CANTILEVERED DEAD SHAFT, THE ONE OF SAID END PLATES AT SAID UNOBSTRUCTED END OF SAID ROLLER SHELL BEING DISHED AND THE FREE END OF SAID CANTILEVERED DEAD SHAFT AND THE SUPPORTING MEANS AN BEARING MEAN AT SAID FREE END OF SAID CANTILEVERED SHAFT LYING WITHIN THE DISHED END PLATE AND SAID ROLLER SHELL. 